@misc{indiciaeb8d9790a9f7f,
  title = {A simple electron cone interlock system for the clinac-18.},
  author = {Y K Chan and B Walulik},
  year = {1980},
  doi = {10.1148/radiology.135.1.7360974},
  url = {https://pubmed.ncbi.nlm.nih.gov/7360974/},
  note = {Source identifier: 7360974}
}